Thread cutting and clamping device for sewing-machines.



G. COLE.

THREAD CUTTING AND CLAMPING DEVICE FOR SEWING MACHINES.

APPUCATION man MAR-17.19M-

1,197,797, Patented S t. 12,1916.

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G. COLE.

THREAD CUTTING AND CLAMPING DEVICE FOR SEWING MACHINES- APPLICATIONFILED MAR 17, 1915.

Patented Sept. 12, 1916;

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UNITED sTAs PATENT orrrc.

GLENN COLE, or CHICAGO, ILLINoIs, ASSIGNOR To THE 'RE'ECE BUTToN HOLEMACHINE COMPANY, or BOSTON, MASSACHUSETTS, A CORPORATION or MAINE.

THREAD CUTTING AND CLAMPING DEVICE FOR SEWING-IIIACHIN Specification ofLetters Patent. Patented Sept 12, 1916.

Application filed March-17,1915. Serial No.;15,025.

T 0 all whom it may concern Y Be it known that I, GLENN COLE, a citizenof the United States, residing at Chicago, county of Cook, State ofIllinois, have invented an Improvement in Thread Cutting and ClampingDevices for Sewing-Machines, of which the following description, inconnection with the accompanying drawing is a specification, likecharacters on the drawing representing like parts.

This invention relates to sewing machines and has for its object toprovide a noveldevice for cutting the needle thread at the end of thestitching operation and for clamping the end of the thread leading tothe source of supply until the stitching operation is started againthereby relieving the operator of this duty and insuring the correctformation of the first stitches when the machine is started.

While my invention is capable of use in connection with sewing machinesof clifferent types, I have chosen herein to illustrate it as it wouldbe employed in a buttonhole sewing machine of the well-known Reece type,examples of which are shown in the following United States patents: No.49%,280, March 28, 1893; No. 655,687, August 7, 1900; No. 1,030,589,June th,-1912. Buttonhole sewing machines of this type are provided withworl'z-clamping means and stitch-forming mechanism which have a movementrelative to each other not only to give the work a relative feedingmovement during the stitching on the buttonhole, but also to move theparts from buttonholecutting position to stitching position before thestitching operation on the bnttonhole be gins and then to return theparts to buttonhole-cutting position from stitching position after thebuttonhole has been completed. Said machines are also provided with abuttonhole-cutting device which operates to cut the buttonhole eitherbefore or after the stitching'operation and when the parts are inbuttonhole-cutting position. The construction of machines such asillustrated in the above-mentionedpatents is such that the machine isbrought to rest at the end of a predetermined. cycle of operations withthe parts in buttonhole-cuttlng position, and when the machine isstarted the work-clamping means and stitch-forming mechanism are given arelative movement to bring them from buttonhole-cutting tonhole has beencompleted, the stitch-forming mechanism is brought to rest and the.work-clamplng means and, stitch-forming mechanism have a further finalrelative movement tobrin'g them into their initial position, duringwhich final movement the work is automatically unclamped. Thebuttonhole-cutting mechanism operates to cut the buttonhole when theparts are in their buttonhole-cutting position and either before orafter the stitching operation.

My present invention comprehends a novel thread-clamping device which isrendered operative automatically by the relative movement of the stitchframeand workclamping means to clamp theneedle thread above the workafter the stitching operation has been completed on a buttonhole andduring the final relative movement of the stitch-forming mechanism andwork-clamp ingmeans by which theyare brought from stitching positioninto buttonhole-cutting position and to hold the end of the needlethread firmly clamped until the machine has been started for stitchingthe-next succeeding buttonhole and the initial stitches are beingformed, after which the thread is antomatically released. Associatedwith the thread clamp is a thread cutter by which the needle thread isout after it has been clamped.

In my improved device the clamping of the needle thread is accomplishedwhile the stitch-forming mechanism and work-holding means have onepositionvrelative to each other, that is, while they are moving fromtheir stitching to buttonhole-cutting position, and the unclamping ofthe needle thread is accomplished while they have an- .other positionrelative to each other, that is, while they are in stitching position.'means which I have herein illustrated for actuating the thread-clampingdevice by The the relative movement between the stitch frame and clampframe is such as to cause the needle thread to be clamped when thestitch frame and clamp frame have one position relative to each otherand to cause the needle thread to be unclamped when they have anotherposition relative to each other.

In order to give an understanding of my invention, I have illustrated inthe drawings a selected embodiment thereof which will now be described,after which the novel features will be pointed out in the appendedclaims.

Figure 1 of the drawings is a side view of a portion of abuttonhole-stitching machine of the Reece type having my improvementsapplied thereto; Fig. 2 is a plan view of Fig. 1 with a portion of theoverhanging arm of the stitch frame broken out; Fig. 3 is an enlargedside view of my improved thread cutter and clamp showing the parts indifferent positions; Fig. is a section on the line x50, Fig. 2; Figs. 5,6, 7, 8 and 9 are fragmentary detail views of the clampactuating membershowing the parts in different positions.

In the sewing machine herein illustrated, the stitch-forming mechanismis supported on a so-called stitch frame 1, and it comprises the usualupper and under threadhandling mechanism which cooperate to concatenatethe edge stitches of the buttonhole. The under thread-handling mechanismis not herein illustrated, but is of the usual construction found inbuttonhole sewing machines of the Reece type. The upper thread-handlingmechanism is shown as comprising an eye-pointed needle 4 carried by theusual needle bar 3 which reciprocates in bearings in an overhanging arm2 formed on the stitch frame 1. The workclamping means is herein shownas the usual work clamps 5 carried by arms 6 that are pivoted at 80 to aframe 7 hereinafter referred to as the clamp frame, all as usual inbuttonhole sewing machines of the abovementioned type. The parts areshown in full lines in Fig. 1 in buttonhole-cutting position, that is,in the position they occupy when the machine has been brought to rest atthe end of the stitching operation on a buttonhole, and as is well knownto those familiar with buttonhole sewing machines of this type, when themachine is started the work clamps 5 are first operated to clamp thework in position and the cutter 90 is operated to cut the buttonhole.The stitch frame 1 and clamp frame 7 then have a relative movement tobring the needle into the dotted line position, Fig. 1, at which timethe stitching mechanism is set in operation to begin the stitching ofthe buttonhole. During the stitching of the buttonhole, the stitch frameand clamp frame have a relative movement to insure the proper feeding ofthe work, and the stitch-forming mechanism also has a turning movementto enable the stitches to be formed around the ends of the buttonhole,and after the buttonhole has been completed, the stitch frame 1 andclamp frame 7 have a further relative movement to bring the parts intothe relative position shown in Fig. 1, during which movement the work isunclamped automatically and the clamps 5 are raised. When the stitchingon any buttonhole has been completed, the stitch frame has such positionthat the needle and needle bar occupy approximately the dotted lineposition, Fig. 1, and the final relative movement between the stitchframe and clamp frame by which they are carried from stitching positionto buttonhole-cutting position, results in carrying the needle andneedle bar from the dotted to the full line position, Fig. 1.

Inasmuch as the operation of a buttonhole sewing machine of the abovetype is well known to those skilled in the art, it is not necessary tofurther describe its construction or operation.

As stated above, I have provided herein a novel thread clamp which isrendered operative automatically by the relative movement between thestitch frame and clamp frame to grip or clamp the needle thread afterthe stitching operation is completed on any buttonhole and while thestitch frame and clamp frame are having their final relative movementfrom stitching position to buttonhole-cutting position, which threadclamp holds the end of the needle thread leading to the needle until thestitch-forming mechanism and work-holding means are again carried intostitching position relative to each other and the stitching hascommenced on the next succeeding buttonhole thereby insuring that whenthe stitching operation is begun the first stitch will be properlyformed without danger that the end of the needle thread will be drawnthrough the work when the needle loop is being formed during the firststitch.

My improved thread-clamping device is rendered operative to clamp thethread when the stitch-forming mechanism and work clamps are in oneposition relative to each other and to release the thread when they arein another position relative to each other.

My improved thread-clamping device is herein shown as carried by thework-clamp ing mechanism and it is illustrated as comprising tworelatively. movable clamping jaws 8 and 9 carried by two arms 10 and 11,respectively. The arm 10 is fixedly mounted to one of the arms 6 of thework-clamping mechanism. in some suitable way, as by means of a screw13, and the arm 11 is shown as pivotally mounted to the arm 10, as at12, said arm 11 having a slot 14. therein in which operates a pin 15carried by the arm 10, said slot operating to limit the swingingmovement of the arm 11. The clamping jaw 8 is thus a stationary jaw, andtheclamping jaw 9 is a movable jaw. Means are provided for closing thejaws together when the stitch frame and clamp frame are moving fromstitching to buttonhole-cutting position, and these clamping jaws are sopositioned that during such relative movement the needle thread t willbe drawn between them. The closing of the jaws thus clamps the needlethread. Said means are also constructed so that they will hold the jawsclosed until after the stitch-forming mechanism and work-holding meansmove from buttonhole-cutting into stitching position when the machine isagain started, said means operating to permit the jaws to open torelease the thread just as the initial stitches are formed on the nextsucceeding buttonhole. These means, therefore, close the thread-clampingjaws to clamp the thread when the stitch-forming mechanism andwork-clamping means are in one position relative to each other andpermit the jaws to open to release the thread when they are in anotherposition relative to each other. In the illustrated embodiment of myinvention the jaws are normally held open by a spring 25 which issecured to an arm 23 extending from the arm 11. For closing the jaws atthe proper time and for holding them closed until the needle thread isto be released,'I have herein provided a clamp-actuating member 16 whichis secured to the stitch frame and cooperates with the arm 11 as thestitch frame and clamp frame have their relative movement to move thejaw 9 against the jaw 8. This clamp-actuating member 16 is shown asadjustably secured to a bracket 17 by means of two screws 19 whichextend through a slot 20 formed in the end of the member 16, and thebracket is secured to the stitch frame by a screw 18, this constructionproviding for any necessary adjustment of said clamp actuating member.The clamp actuating member 16 is preferably somewhat resilient, and itis formed at its end with a cam portion 21 and with a projection orextension 22 below the cam portion. This cam portion 21 and extension 22coiiperate with the downwardly-extending portion 24 of the finger 23which extends laterally from the arm 11 carrying the movable clampingjaw 9, thereby to clamp the needle thread 6 and to release the latter atthe proper times in the cycle of operations.

As stated above, the parts are shown in Figs. 1 and 5 in the positionsthey assume when the machin has been brought to rest at the end of thestitching operation on a buttonhole, and it will be noted that theportion 24 of the finger is engaged by the cam portion 21 of theclamp-actuating member 16 and is above the extension 22. lVhen themachine is started the work clamps 5 are first depressed to clamp thework in position and the stitch frame and clamp frame are moved relativeto each other to bring the needl 4 into the dotted line position, Fig.1, at which time the stitching operation begins. When the stitching onthe buttonhole has been completed the needle occupies substantially thedotted line position, Fig. 1, and the work clamps 5 are still depressed.During the stitching operation the threadolamping jaws 8 and 9 areseparated from each other, as shown in dotted lines Fig. 2, this beingaccomplished by means of the spring 25, as above described.

The work clamps 5 are released automatically at the termination of thestitching operation and while the needle is in approximately the dottedline position Fig. 1, and this releasing movement of the clamps bringsthe portion 24 of the finger 23 into line with the cam 21 of theclamp-actuating member. WVhen the stitch frame and clamp frame havetheir final relative movement to carry the needle from the dotted to thefull line position, Fig. 1, the needle thread is carried between the twojaws 8 and 9, which it will be understood are separated from each otherby the action of the spring 25. This relative movement of the stitchframe and clamp frame also causes the clamp-actuating member 16 to moverelative to the finger 23, thus bringing the cam 21 into engagement withthe portion 24 of the finger, as shown in Figs. 1 and 5. The action ofthe cam 21 on the finger 24 is to force yieldingly the arm 11 laterally,thereby closing the clamping jaw 9 against the clamping jaw 8. Thisoperation, as stated above, occurs after the stitch frame and clampframe have had sufficient relative movement to bring the needle thread tbetween the clamping jaws so that the action of the cam 21 on theportion 24 resultsinclamping the portion of the needle thread betweenthe needle and the work between the two clamping jaws S and 9. When themachine comes to rest in the full line position, Fig. 1, the needlethread is thus clamped between the jaws 8 and 9 and is held clamped bythe action of the member 16 on the extension 24 of the finger 23.

When the machine is set in operation for' sewing the neXt succeedingbuttonhole the work clamps 5 are first depressed, thus carrying theportion 24 of the finger 23 down wardly into the position shown in Fig.6. This movement does not, however, release the thread clamps 8 and 9because the portion 22 of the member 16 is still in engagement with thedownwardly-turned end 24 of the finger 23. After the thread is clampedthe stitch frame and clamp frame have a relative movement before thestitching operation begins to bring the needle into the relativeposition shown in dotted lines Fig.

1, and during this movement the downwardly-extending portion 2 1 of thefinger 23 is in engagement with the inner face of the extension 22 ofthe member 16, as shown in full lines Figs. 2 and 3. At the time thatthe stitching operation begins the parts are in approximately theposition shown in Figs. 2 and 3 and the end of the needle thread isstill clamped between the jaws 8 and 9 so that when the first stitch onthe buttonhole is formed the end of the needle thread will be firmlyheld in the thread clamp to insure the correct formation of the firststitch. As the stitching operation proceeds the stitch frame and clampframe have a relative feeding movement to stitch down one side of thebuttonhole, and during this movement the extension 22 is withdrawn fromthe portion 2 1 of the finger 23, as shown in Fig. 7. The disengagementof these parts, however, does not actually take place until after thefirst stitch has been formed. As soon as the extension 22 has beenwithdrawn from the portion 24 of the finger 23, the spring 25 actsautomatically to open the thread-clamping jaws thereby to release theend of the needle thread, but as stated above, this does not occur untilafter the first stitch at least has been formed. During the furtheroperation of stitching the buttonhole, the stitch frame and clamp framehave a relative movement to still further withdraw the member 16 fromthe finger 23 as the stitching is carried down one side of thebuttonhole. When the stitching is carried around the end of thebuttonhole and up the other side, the member 16 will be moving towardthe finger 23, but as the thread-clamping jaws are opened the portion 2%of the finger 23 occupies the dotted line position in Fig. 2. As aresult, the projection 22 of the member 16 will pass in behind theportion 24L of the finger 23.

Wl1en the stitching operation is completed the relative movement betweenthe stitch frame and clamp frame has brought the parts intosubstantially the position shown in Fig. 8. At this time the work isunclamped automatically and the raising of the clamps and their arm 6carries the por tion 24: of the finger 23 upwardly in front of the cam21 as shown in Fig. 9. At this time the clamping jaws S and 9 are openedand in position to receive the needle thread If between them when thestitch frame and clamp frame have their final relative movement to carrythem into the relative posi tion shown in full lines Fig. 1. During thisrelative movement the cam 21 engages the portion 24: of the finger 23and forces the arm 11 laterally thereby shutting the clamping jaw 9against the jaw 8 and clamping the needle thread as above described.

It will thus be seen that I have provided a thread-clamping device whichis rendered operative by the relative movement of the workclamping meansand stitch-forming mechanism to clamp automatically the needle thread atthe end of the stitching operation and to release said needle threadwhen the stitching has begun on the next succeeding buttonhole. It willalso be seen that the device herein illustrated is so constructed thatthe clamping of the needle thread is accomplished when the stitchformingmechanism and work-clamping means are in one position relative to eachother while the release of the needle thread is accomplished while theyare in another position relative to each other. With my device theoperator is relieved entirely of the duty of holding the end ofthevneedle thread when the stitching operation is commenced.

Associated with my thread-clamping device is a thread cutter by whichthe needle thread is automatically severed. This thread cutter is shownas a blade 26 fastened to the underside of the clamping jaw S. Thethread is cut by the operation of shifting the work into position tohave a fresh buttonhole stitched. When a buttonhole is completed and theneedle thread has been clamped, as above described, the needle threadextends from the clamp directly to the work. After the work has beenunclamped the operator shifts it laterally into correct position to havethe next buttonhole stitched, and this lateral shifting movement of thework brings the needle thread 25 against the edge of the cutter 26, asshown by the dotted lines Fig. 4, thus automatically severing the needlethread.

While I have illustrated herein a selected embodiment of my invention, Ido not wish to be limited to the constructional features shown. Further,I wish to state that while the invention is shown as applied to abuttonhole sewing machine of the Reece type, yet it is equallyapplicable to other types of sewing machines.

I claim:

1. In a sewing machine, the combination with stitch-forming mechanism,of workclamping means situated above the work, said stitch-formingmechanism and workclamping means having a movement relative to eachother in a direction parallel to the work held by said work-clampingmeans to effect a predetermined cycle of operations including astitching operation, a thread-clamping device carried by thework-clamping means, and means rendered operative by said relativemovement to cause the thread-clamping device to clamp the thread at theend of the stitching operation.

2. In a sewing machine, the combination with stitch-forming mechanism,of workclamping means situated above the work,

said stitch-forming mechanism and workclamping means having a movementrelative to each other in a direction parallel to the work held by saidwork-clamping means to effect a predetermined cycle of operationsincluding a stitching operation, a thread-clamping device carried by thework-clamping means, and means rendered operative by said relativemovement to cause the thread-clamping device to clamp the thread at theend of the stitching operation and to release the thread immediatelyafter the formation of the initial stitches of the next succeedingstitching operation.

3. In a buttonhole sewing machine, the combination with stitchformingmechanism, of workclamping means situated above the work, saidstitch-forming mechanism and work-clamping means having a movementrelative to each other during which the stitching around a buttonhole isperformed, thread-clamping jaws carried by the work-clamping means, anda clampactuating member secured to the stitch frame and adapted toactuate said jaws to clamp the thread therebetween during such relativemovement at the end of a stitching operation on a buttonhole.

l. In a sewing machine, the combination with stitch-forming mechanism,of workclamping means situated above the work, said stitch-formingmechanism and workclamping means having during each cycle of operationsa movement relative to each other both during and after a predeterminedstitching operation, a thread-clamping device carried by thework-clamping means, and means rendered operative by said relativemovement to cause the thread-clamping device to clamp the thread at theend of the stitching operation when the stitch-forming mechanism andwork-clamping means are in one position relative to each other and torelease the thread as the initial stitches of the next succeedingstitching operation are being formed and when the stitch-formingmechanism and work-clamping means are in another position relative toeach other.

5. In a sewing machine, the combination with a stitch frame carryingstitch-forming mechanism, of a clamp frame, said frames having amovement relative to'each other, a work-clamping member carried by theclamp frame and movable relative thereto into and out of operativeposition to clamp and unclamp the work, thread-clamping means carried bysaid work-clamping member, and means rendered operative by the relativemovement of the frames to clamp the thread in said thread-clampingmember at the end of the stitching operation.

6. In a sewing machine, the combination with a stitch frame carryingstitch-forming mechanism by which predetermined stitching operations areperformed, of a clamp frame, said frames having a movement relative toeach other both during and after each stitching operation, aWork-clamping member carried by the clamp frame and movable relativethereto into and out of operative position to clamp and unclamp thework, thread-clamping means carried by said work-clamping member, andmeans rendered operative by the relative movement of the frames to clampthe thread in said thread-clamping member at the end of the stitchingoperation and to release the thread immediately after the formation ofthe initial stitches of the next succeeding stitching operation.

7. In a sewing machine, the combination with a stitch frame carryingstitch-forming mechanism, of a clamp frame, said frames having amovement relative to each other, a work clamp carried by said clampframe, two thread-clamping jaws both secured to the work clamp andcapable of movement relative to each other, and a clamp-actuating membersecured to the stitch frame, relative movement of said frames causingthe clampactuating member to move the thread-clamping jaws relative toeach other to clamp the thread therebetween at the end of the stitchingoperation.

8. In a sewing machine, the combination with a stitch frame carryingstitch-forming mechanism, of a clamp frame, said frames having amovement relative to each other, a work clamp carried by said clampframe, thread-clamping jaws secured to the work clamp, and aclamp-actuating member secured to the stitch frame, relative movement ofsaid frames causing the clamp-actuating member to move thethread-clamping jaws relative to each other to clamp the threadtherebetween at the end of the stitching operation and to release thethread immediately after the formation of the initial stitches when themachine is again set in operation.

9. In a buttonhole sewing machine, the combination with a stitch framecarrying stitch-forming mechanism, of a clamp frame, said frames havinga movement relative to each other, work clamps pivotally mounted to theclamp frame, thread-clamping jaws secured to the work clamps, one ofsaid aws having a projection associated therewith, and a clamp-actuatingmember secured to the stitch frame and provided with means which isbrought into engagement with said projection during said relativemovement at the end of the stitching operation thereby to clamp thethread between said jaws and to maintain operative engagement withsaidprojection during the further movement of the frames and until theinitial stitches have been formed at the beginning of the stitchingoperation.

10. In a sewing machlne, the combination with a stitch frame carryingstitch-forming mechanism, of a clamp frame, a work clamp pivotallymounted to said clamp frame, tl'iread-clamping jaws carried by the workclamp, one of said jaws having a projection,

a clamp-actuating member secured to the stitch frame and provided with acam portion situated to engage said projection when the work clamp isopened and at the end of the stitching operation thereby to clamp thethread and also provided with an extension which acts on saidprojection. to hold the thread clamped after the work clamp is inoperative engagement with the work and until the initial stitches areformed at the beginning of the next stitching operation.

11. Ina sewing machine, the combination with a stitch frame carryingstitch-forming mechanism, of a clamp frame carrying workclamping means,said stitch frame and clamp frame having a movement relative to eachother in a direction parallel to the work held by the work-clampingmeans, a threadclamping device carried by the work-clamp ing means abovethe work, means actuated by the relative movement of said frames tocause said thread-clamping device to clamp the thread at the end of thestitching operation, and a thread-cutting device associated with saidthread-clamping device.

12 In, a buttonhole sewing machine, the combination with a stitch framecarrying stitch-forming mechanism, of a clamp frame carryingwork-clamping means, threadclamping jaws carried by the work-clampingmeans above the work, a clamp-actuating member secured to the stitchframe and operating through the relative movement of said frames toactuate said jaws to clamp the thread therebetween at the end of astitching operation on a buttonhole and to release said thread after theinitial stitches have been formed on the next succeeding buttonhole, anda thread-cutter associated with one of said thread-clamping jaws.

13. In a buttonhole sewing machine, the combination with stitch-formingmechanism, of work-clamping means situated above the work, saidstitchforming mechanism and work-clamping means having a relativemovement during which the edge stitches of a buttonhole are formed andthe parts are moved from stitching position to buttonhole-cuttingposition, and means carried by said work-clamping means and actuated bysaid relative movement to clamp the thread at the end of a stitchingoperation when the stitch-forming mechanism and work-clamping means arein one position relative to each other and to release said thread as theinitial stitches of the next succeeding stitching operation are beingformed and when the stitch-forming mechanism and work-clamping means arein another position relative to each other. 1

14. In a buttonhole sewing machine, the combination with stitch-formingmechanism, of work-clamping means situated above the work, saidstitch-forming mechanism and work-clamping means having a relativemovement during which the edge stitches on a buttonhole are formed andthe parts are moved from stitching position to buttonhole-cuttingposition, a pair of thread.- clamping jaws carried by the work-clamp ingmeans above the work and situated so that the needle thread is carriedbetween them during the relative movement of said stitch-formingmechanism and work-clamp ing means from stitching to buttonholecuttingposition, and means actuated by said relative movement to close saidjaws thereby to clamp the needle thread and to release said jaws therebyto release the thread after the work-clamping means and stitch-formingmechanism have been moved into stitching position.

15. In a sewing machine, the combination with stitch-forming mechanism,of work-clamping uneans situated above the work, said stitch-formingmechanism and work-clamping means having a movement relative to eachother in a direction parallel to the work held by the work-clampingmeans to effect a predetermined cycle of operations including thestitching operation, and a thread-clamping device carried by thework-clamping means and actuated by said relative movement to clamp thethread at the end of the stitching operation.

16. In a sewing machine, the combination with stitch-forming mechanism,of work-clamping means situated above the work, said stitch-formingmechanism and work-clamping means having a movement relative to eachother in a direction parallel to the work held by the work-clampingmeans to efiect a predetermined cycle of operations including thestitching operation, and a thread-clamping device carried by thework-clamping means and actuated by said relative movement to clamp thethread at the end of the stitching operation and to release the threadduring the formation of the initial stitches of the next succeedingstitching operation.

In testimony whereof, I have signed my name to this specification.

GLENN COLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

